There were several things wrong with it:
1. Time travel as a plot device - uninspired and woefully unoriginal.
2. The Borg - Now, don't get me wrong. I loved these guys back in the day, but by Season 7 the Borg had just become so passe.
3. Voyager returning home - Bad decision. Would have been much more striking if it was made clear at the end that the ship never got back to the Alpha Quadrant.
4. The ending of the final episode seemed rushed. Compare it to the final ep of DS9. Now THAT was a good series finale.
So overall, Voyager was a good series, but it ended on a weak note.
1. Time travel as a plot device - uninspired and woefully unoriginal.

2. The Borg - Now, don't get me wrong. I loved these guys back in the day, but by Season 7 the Borg had just become so passe.

3. Voyager returning home - Bad decision. Would have been much more striking if it was made clear at the end that the ship never got back to the Alpha Quadrant.
4. The ending of the final episode seemed rushed. Compare it to the final ep of DS9. Now THAT was a good series finale.
So overall, Voyager was a good series, but it ended on a weak note.